Spring checking device



Oct. 27, 1931. H. J. STEAD SPRING CHECKING DEVICE Filed sept'. 12, 1927 III Ill ,75%mw n n n l x K H'. STEM) '1 IN1/avra@ /7 TMR/v5 vs.

Patented er. 27, 193:

UNITED STATES PATENT OFFICE HAROLD J. STEAD,v OF GENEVA, NEW YORK, A SSIGNOR TO STEADFAST MFG. CO., INC., 0F

Y GENEVA, NEW YORK, A CORPORATION OFNEW YORK SPRING CHECKING DEVICE Application i'Ied September 12, 1927. Serial No. 219,077.

the body were rigidly secured to the axles.

When an axle is raised by an inequality in will approach the frame. The spring will then return toits normal position, lifting the frame away from the axle when so doing. This movement having once been started, the inertia of the spring will cause the movement to be repeated with a diminishing range of movement, with the result that one road shock to a wheel will cause several movements of the frame, and the main object of my invention is to provide a means whereby this continued movement of the spring will be substantially eliminated.

Another object is to provide a means whereby the movement of the spring in both directions will be controlled and uniform.

Other objects and advantages relate to the specic construction and form of part, all as will more fully appear from the following description, taken in connection with the accompanying drawings, in which:

Figure 1 is an elevation of parts of a frame, spring and axle of an automobile showing one of my devices installed thereon.

Figure 2 is a section on line 2-2 of Figure l.

Figure 8 is a section on line 3-3 of Figure 1.

Figure 4 is a section on line 4-4, Figure 2.

Figure 5 is a section on line 55, Figure 2.

In the drawings like numbers refer to like parts.

My device consists of an outside case 1- circular in form open at one end and partially closed at the other, the partially closed end the road, the spring will iiex and the axlehaving a circular kopening 20- with an' inturned flange -21- into which one end of the rotor -7- (hereinafter described) is journaled.

The case 1- is made of steel or'other appropriate material and is preferably lined on its inner periphery with a circular band *2- of' brake-lining or other durable material. Brake-shoes *3* and -4-,' approximately semi-circular in form, and of a shape to conform to the shape of the lining -3-, are positioned in opposed spaced'relation within the case h`1--- and against lining -8-. The opposed faces of brake-shoes -3- and 4r-d are cut away, as indicated at -5- and -6 in Figure 4 to permit the insertion between them of rotor -7-.

Rotor -7- is provided with bearing surfaces -8- and 9` which bear respectively against bea-ring surfaces -10- and -l0- of brake-shoe -3-, and bearing surfaces -11'- and -11- of brake-shoe -4-. For the purpose of economy and to permit replacement, bearing surfaces 84 and -9- are formed of separate plates held in position on rotor 7; by means of bolt -l2-, but it will be understood that ksuch bearing surfaces could, if desired, be formed as an integral part of rotor -7-.

Spring 1S-is interposed between bearing surface -8- and brake-shoe -3-, and spring *lllis interposed between bearing surface 9 and brake-shoe -4-, for the purpose of vholdingVV said brake-shoes at all times in contact with lining --2. The outer end of rotor- -7-4 is provided with a hole -15- for the reception of one end of lever -16-`, and carries a set-screw -17- adapted to engage a depression -18- in lever -l6-, there being a plurality, in this case three, of such depressions -18- to permit lateral adjustment of lever 16- with relation to rotor -'-7- for the purpose of increasiizig or decreasing the leverage on rotor A cover -19-, fastened in position by screws -22- or other convenient means, has a circular opening -23- with an inturned flange -24- in which the outer end of rotor -7- is journaled. A bracket -25- is secured to the outside of the partiallyclosed n end of case -lby rivetsv -26- or other convenient means7 and is in' turn attached to the frame 27` of the vehicle by rivets -28- or other convenient means. A; clamp -29- is held in position on axle -30- by bolt "-,31-7w andis connected tothe outercend f of lever 164- by means ofllink--32-. Y

Operation y Tlie'ioperation 'devicefis as follows:

When a wheelstrikes anine'quality in the road, the axlev 30+ Will move upwards to-V wards frame -27- flexing'spring 33'. This will raise link -32-,--with relationl togframe -27, thereby raising the end of lever 1G- andV lrotating the rotor-'f7`. .i The direction dicated `by the arrow-in Figure/i. When V4direction of `theseiorces exerted by the cam '-3- and respectively,.andinsconsesurfaces' --8-'-V andL---Q-y isoblique' to the yperiphery of the Vouter faces of brakeshoes this -movement is taking place Vcam surface Y l--8- will'eXert pressure against bearing surl Vface lOl-,and cam'surface -9-'- willeXert pressure againstbearing surface-11@vv The quence tends'fn'oty only-to'movebrake-shoes n -3-` and -4- aroundjthe innerperiphery 'of lining -2-1 but? also tends to 4force them Aagainst Y lining f -Q-f' The resulting Afriction between these partstends` to 'holdl rotor u A -'V7ffromfrotating-,and' tothat extent retardstheactionoffspring33+.- Similarly, 1 when thespring'reacts to its formen position,

aXle -30-1-Will move away from frame *Q7-s reversing the movement of rotor -7-f and causing camsurface -8- tov exert pres- Y sure in bearing surface-#10 andcam sur- 'face V--Qnt'o exert'pressure' on bearing surlThis will cause the same re- :itarding `el'ect :on 'rotor #-7; asin the :j ustdescribed movement: of rotation in the Aopposite direction. v- J Y It Werbe understood-emaille "amount of pressureforc'ingthe 'brake-shoes'. -.-3-: and

c againstlthe, 1ining} '2 canlbe Ivar. ,i Tied at, Wm by., hanging, thelengths O f1 the v cam surfaces 78- and will change theidirection of the forces exeV .erted by the-Inv l against .fthe brake-shoes 34- and v AlthoI- have shown and'desc'ribedy a speg cific 'structure and form of parts as illustra- "tive ofl an embodiment off myl invention, I

doi not desire to restrict-myselftozthe exact rform, shape or relation of parts", asvarious- `changes may: bemade --Ithe' appended claim'. f g' rwithin the scope of Y I claim described5 a casn In a device of vthe class 1 'ing/a. plurality ofv rigidfbrake shoes inthe `casing 1n frictional contacttherewith, a ro-l l tat-able member. having opposed-:flatsurfaces f 'ji-Teslctvvly engagingthe' brakeshoes at points spaced from one'end of-:the brake shoes i -9- whichfin turnv v i 

